mirror of
https://github.com/photonstorm/phaser
synced 2024-11-16 09:48:18 +00:00
96 lines
3.1 KiB
JavaScript
96 lines
3.1 KiB
JavaScript
/**
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* Original shader by Trisomie21 (https://www.shadertoy.com/view/MslGRH)
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* Tweaked, uniforms added and converted to Phaser/PIXI by Richard Davey
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*/
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Phaser.Filter.BinarySerpents = function (game) {
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Phaser.Filter.call(this, game);
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this.uniforms.march = { type: '1i', value: 100 };
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this.uniforms.maxDistance = { type: '1f', value: 5.0 };
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this.uniforms.fog = { type: '1f', value: 5.0 };
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this.fragmentSrc = [
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"precision mediump float;",
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"uniform vec3 resolution;",
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"uniform float time;",
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"uniform int march;",
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"uniform float maxDistance;",
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"uniform float fog;",
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"// With tweaks by PauloFalcao and Richard Davey",
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"float Texture3D(vec3 n, float res) {",
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"n = floor(n*res+.5);",
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"return fract(sin((n.x+n.y*1e5+n.z*1e7)*1e-4)*1e5);",
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"}",
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"float map( vec3 p ) {",
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"p.x+=sin(p.z*4.0+time*4.0)*0.1*cos(time*0.1);",
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"p = mod(p,vec3(1.0, 1.0, 1.0))-0.5;",
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"return length(p.xy)-.1;",
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"}",
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"void main( void )",
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"{",
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"vec2 pos = (gl_FragCoord.xy*2.0 - resolution.xy) / resolution.y;",
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"vec3 camPos = vec3(cos(time*0.3), sin(time*0.3), 1.5);",
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"vec3 camTarget = vec3(0.0, 0.0, 0.0);",
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"vec3 camDir = normalize(camTarget-camPos);",
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"vec3 camUp = normalize(vec3(0.0, 1.0, 0.0));",
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"vec3 camSide = cross(camDir, camUp);",
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"float focus = 2.0;",
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"vec3 rayDir = normalize(camSide*pos.x + camUp*pos.y + camDir*focus);",
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"vec3 ray = camPos;",
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"float d = 0.0, total_d = 0.0;",
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"const int MAX_MARCH = 100;",
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"float c = 1.0;",
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"for (int i=0; i < MAX_MARCH; ++i) {",
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"if (i < march) {",
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"d = map(ray);",
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"total_d += d;",
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"ray += rayDir * d;",
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"if(abs(d)<0.001) { break; }",
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"if(total_d>maxDistance) { c = 0.; total_d=maxDistance; break; }",
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"}",
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"}",
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"vec4 result = vec4( vec3(c*.4 , c*.6, c) * (fog - total_d) / fog, 1.0 );",
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"ray.z -= 5.+time*.5;",
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"float r = Texture3D(ray, 33.);",
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"gl_FragColor = result * (step(r, .3) + r * .2 + .1);",
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"}"
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];
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};
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Phaser.Filter.BinarySerpents.prototype = Object.create(Phaser.Filter.prototype);
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Phaser.Filter.BinarySerpents.prototype.constructor = Phaser.Filter.BinarySerpents;
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Phaser.Filter.BinarySerpents.prototype.init = function (width, height, march, maxDistance) {
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if (typeof march === 'undefined') { march = 100; }
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if (typeof maxDistance === 'undefined') { maxDistance = 5.0; }
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this.setResolution(width, height);
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this.uniforms.march.value = march;
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this.uniforms.maxDistance.value = maxDistance;
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};
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Object.defineProperty(Phaser.Filter.BinarySerpents.prototype, 'fog', {
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get: function() {
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return this.uniforms.fog.value;
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},
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set: function(value) {
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this.uniforms.fog.value = value;
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}
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});
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